stylesClassRuleExtractorFactory,
OptimalClassNameGenerator.getDefaultInstance());
generator.addRuleExtractor(classRuleExtractor);
// Add the rule group extractor.
RuleExtractor groupRuleExtractor = new GroupRuleExtractor();
generator.addRuleExtractor(groupRuleExtractor);
// Create the extractor which uses both the optimizer and the
// generator and return it.
return new DefaultStyledDOMThemeExtractor(optimizer, generator);